ARLINGTON, Mass.—American Alarm and Communications, based here, announced this week that it has acquired AAA Custom Alarm Systems of Warwick, R.I. The buy adds density to American Alarm’s existing operations in Rhode Island and unites under one roof several companies with a long history together.

ARLINGTON, Mass.—American Alarm and Communications is having a banner year: The company has acquired a bolt-on in its backyard that adds density and boosts the company’s service capabilities, and it ended its fiscal year with revenues that exceeded expectations.